[cayugabirds-l] radar migration now (before dawn)

[Dave Nutter]

It's now about 5 am, and the radar weather

http://www.wunderground.com/radar/radblast.asp?ID=BGM&region=a5&lat=42.15665817&lon=-75.89051819&label=Binghamton%2c%20NY

shows heavy migration, a blossom of even green around the radar station indicating a layer of birds up to a certain altitude.  As dawn arrives, the green should contract to the radar source as the birds descend and drop off the radar farther out where the earth's curvature makes the radar see higher. 

--Dave Nutter